Onyx and Oligoclase Physical Properties
Tenacity
Not Available
Not Available
Solubility
Not Available
Not Available
Durability
Not Available
Not Available
Specific Gravity
2.55-2.70
2.62-2.67
Fracture
Not Available
Gems, Sixth Edition (2006), Gems, Sixth Edition (2006), Uneven
Cleavage
Indiscernible
From the Greek, oligos and kasein, little cleavage.
Mohs Hardness
6.5-7
6-6.5
Chemical Composition
SiO2
Na(90-70%)Ca(10-30%)(Al,Si)AlSi 2O 8Michael OâDonoghue , Gems, Sixth Edition (2006)
Onyx and Oligoclase Chemical Formula
While comparing Onyx and Oligoclase physical properties, the important data you should know is its chemical composition. Since chemical formula defines the molecular structure of the crystal, most of the physical properties like color, tenacity, solubility are governed by Onyx and Oligoclase chemical formula.
- Chemical formula of Onyx- SiO2
- Chemical formula of Oligoclase- Na(90-70%)Ca(10-30%)(Al,Si)AlSi 2O 8Michael OâDonoghue , Gems, Sixth Edition (2006)
Onyx and Oligoclase Specific Gravity
Another important criteria for qualitative analysis of gemstones is Onyx and Oligoclase Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Onyx and Oligoclase Optical Properties during the identification of gemstone. Specific gravity of Onyx is 2.62-2.67 whereas that of Oligoclase is 2.62-2.67.